Slide-valve



(No Model.) 7

G. G. WALLE. SLIDE VALVE. No. 478,829. Patented July 12,1892

UNITED-STATES PATENT Orr-Ion.

CARL G. WALLE, OF BROOKLYN, NEW YORK.

SLIDE-VALVE.

SPECIFICATION forming part of Letters Patent No. 478,829, dated July12,1892. Application filed April 8, 1892. Serial No. 428,359. (Nomodel.)

To all whom it may concern:

Be it known that I, CARL G. WALLE, a citizen of Norway, residing atBrooklyn, in the county of Kings and State of New York, have inventedcertain new and useful Improvements in Slide-Valves and I do herebydeclare the following to be a full, clear, and exact description of theinvention, such as will enable others skilled in the art to which itappertains to make and use the same.

This invention relates to the slide-valves of steam-engines; and itconsists in the novel construction and combination of the partshereinafter fully described and claimed, whereby the slide-valve isbalanced and works back and forth between the steam-chest faces withoutfriction.

In the drawings, Figure 1 is a longitudinal section through asteam-cylinder provided with a slide-valve according to this invention.Fig. 2 is a cross-section through the same, taken on the line so a: inFig. 1. Fig. 3 is a detail front view of the slide-valve. Fig. t is adetail side view of the slide-valve packing. Fig. 5 isa front 'view of ahorizontal slide-valve and steam-chest.

A is the cylinder, which is of any approved construction, and isprovided with steam-ports a and an exhaust-port a.

B is the steam-chest, and B is the steamchest cover.

0 is the slide valve, which works steamtight between the faces I? and bon the cylinder and steam-chest cover, respectively. The valve 0 isprovided with a valve-rod c for reciprocating it in the ordinary manner.The valve 0 is rectangular in shape and is provided with anexhaust-chamber D, extending clear through it. The steam is admitted andexhausted through the ports in the face I), as indicated by the arrowsin Fig. 1. As the opposite sides of the valve are equal in area, theValve is balanced and works free from friction between the faces I) b.The valve is provided with a rectangular groove d in each working face,and e is the packing, which consists of a hollow rectangular frame whichfits the groove e. The packing is held against the faces Z) Z) bysprings inserted in the grooves d behind it. Steel springs f, as

shown in Fig. 4, may be used, orindia rubber or composition springs, asshown in Fig. 1. The weight of the valve and the moving parts attachedto it are preferably balanced ;by the pressure of the steam in thesteam-chest. Then the valve works in a vertical plane, as shown in Fig.1, a small auxiliary cylinder 9 is secured on the upper end of thesteamchest. A piston 9 slides in the cylinder g and is connected to thevalve by a rod. When the valveslides in a horizontal plane, as shown inFig. 5, an auxiliary cylinder and piston can also be used; but the rodconnecting the auxiliary piston to the slide-valve must be pivoted ateach end. In either case the auxiliary piston has its area proportioned,so that the pressure of the steam against it will balance the weight ofthe valve.

Fig. 5 shows another means for balancing the weight of .the valve. Thisconsists of a hollow rectangular frame It, provided with springs and letinto a rectangular groove in the upper side of the slide-valve. Thisframe it is pressed by its springs against the face h on the upper sideof the steam-chest, and the size of the rectangular frame is such thatthe area of the upper side of the valve against which the steam pressesis less than the area of the lower side of the Valve by the amountnecessary to balance the weight of the valve by the additional pressureof the steam beneath it.

What I claim is 1. The combination, with a cylinder provided with portsanda steam-chest having parallel faces, of a slide-valve working betweenthe said faces and having its opposite sides of equal area, andspring-pressed packing-frames let into the working faces of the saidvalve, substantially as set forth.

2. The combination, with a cylinder provided with ports and asteam-chest having parallel faces, of a slide-valve working between thesaid faces and'having'an exhaustpassage extending through it, andspringpressed packing-frames let into grooves in the working faces ofthe valve around the said exhaust-passage, substantially as set forth.

3. The combination, with a cylinder provided with ports, and asteam-chest having parallel faces, of a slide-valve working be-Intestimony whereof I affix my signature in tween the said faces andprovided with a compresence of two Witnesses. pensating device wherebythe weight of the valve is balanced by the pressure of the steam CARTWALLE 5 in the steam-chest, and spring-pressed pack- Witnesses:

ing-frames let into the Working faces of the IIANs THORSON,

said valve, substantially as set forth. J OHN HANSEN.

